Economizer, regenerator, and the like.



W. MATHESIUS. EGONOMIZBR, REGENERATOR, AND THE LIKE.

APPLICATION FILED 0 01. 16, 1911.

" Patented May 28, 1912.

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COLUMBIA bLANoGRAPH COHWASHINOTDN, D. c.

APPLICATION FILED OCT. 16 1911.

Patented My 28, 1912.

4 SHEETS-SHEET 2.

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' w. MATHESIUS.

EGONOMIZER, REGENERATOR, AND THE LIKE. APPLICATION FILED 00T- 1 6, 1911.

1,027,875, Patented May 28, 1912.

4 SHEETBSHEET 3.

COLUMBIA iLANDuRAPl-l (20.. WASHINGTON, D. c.

W. MATHESIUS.

ECONOMIZER, REGENERATOR, AND THE LIKE. APPLICATION IILED 0OT.16, 1911.

1,027,875; Patented May 28, 1912.

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TlNTTET) STATES PATENT CFFTQE.

WALTI-IER MATHESIUS, OF GHARLOTTENBURG, GERMANY.

EGONOMIZER, REGENERATOB, AND THE LIKE.

Application filed October 16, 1911.

To all whom it may concern:

Be it known that I, TVALTHER MATHESIUS, a subject of the King ofPrussia, and resident of 10 Carmerstrasse, Charlottenburg, near Berlin,Germany, professor, have invented certain new and useful Improvements inEconomizers, Regenerators, and the Like, of which the following is aspecification.

This invention relates to improvements'in economizers, regenerators andthe like, for utilizing the heat of waste gases and the like, and hasfor its object to provide an improved construction thereof which willenable the utilization of the heat from large quantities of such gases.

The apparatus is especially applicable for metallurgical works andparticularly in combination with Cowper stoves where extraordinarilylarge quantities of waste gases often escape into the chimney at atemperature of about 500 C. Heretofore it has frequently been proposedto utilize this heat by means of economizers located between the Cowperstove and the chimney and to utilize this economizer for preheating theblast for the blast furnace before supplying it to the Cowper stove forfurther heating. Such economizers necessitate as large a heating surfaceas possible, for example 1200 to 1800 square meters for a blast furnace'of average size. For this purpose it has been usual to employ groups ofiron tubes as the heating surface but in order to obtain an efficientworking it is necessary that the tubes offer as little resistance aspossible to the flow of the gases and that thetubes be continually freedfrom flue dust. If, however,the tubes are arranged in straightrows onebehind another, the heating surface is not fully utilized inasmuch asthe tubes are deprived of the heating effect of the gases by the tubesimmediately in front thereof. It has therefore been proposed to arrangethe tubes in staggered relation whereby twice the number of tubes areexposed to the direct contact of the hot gases. The gases are howeverdeflected about 90 from their course betweeneach row of tubes andconsequently the resistance to the flow of the gases is so great thatthe flow must be augmented by means of fans or like draft creatingmeans. Moreover, while the straight rows of tubes permit the insertionof a scraping device be tween the tubes, the staggered arrangementrenders this impossible.

Specification of Letters Patent.

Patented May 28,1912.

Serial No. 655,003.

According to the present invention, the foregoing deficiencies areobviated by alternating the tubes relatively to one another in such amanner as to form rows of tubes inclined at an acute angle to thedirection of the flow of the gases. This arrangement enables properutilization of the heat of the waste gases without occasioning anyappreciable resistance to the flow, and further on ables the insertionof a scraper for continually removing the flue dust.

In order that the invention may be clearly understood, reference is madeto the accompanying drawings, which show, by way of example, myinvention as applied to an economizer for use in conjunction with Cowperstoves, part of the tubes being o1nitted for the sake of simplicity.

Figure 1 is a vertical section through the economizer on the line G-H ofFig. 3. Fig. 2 is a vertical section on the line A, B, C, D, E ofFig. 1. Fig. 3 is a cross section on the line J K of Fig. 1. Fig. 4 is across section on the line L M of Fig. 1. Fig. 5 is a detail plan viewshowing one group of tubes, a scraper for the tubes and chain scrapersbetween the tubes. Fig. 6 is a detail sideview of one tube and thescraper therefor. Fig. 7 is a detail plan view of two tubes withscrapers, the J.-iro11 z on the lefthand side being removed, and theupper tube be ing shown with its scraper in cross-section.

The economizer comprises essentially groups of tubes at which arearranged in the manner illustrated'in Figs. 3, 4: and 5, that is to say,in rows at an acute angle to the flow of the gases. The groups of tubesa which form the heating surface, are arranged between head'chambers band b having flat sides 6 and a respectively, in which the wrought irontubes are expanded in the usual manner. The waste gases are admit ted at(Z, traverse the two compartments formed by the central wall a and passaway at e. The cold air is supplied to the head chambers 12 at f andafter traversing the tubes a and being heated therein passes out at g,the air moving in the opposite direction to the flow of the hot gases.The flue dust suspended in the hot gases settles on the tubes a and onthe bottom 0 and is removed therefrom by scrapers, as hereinafterdescribed. The flue dust on the bottom 0 is removed by means ofscraperchains h, as shown in Figs. t and 5 which are arranged betweeneach row of tubes and extend across the whole width of the apparatus.The chains h are continuously drivenv from an electro-motor 2' and geardriven shaft is. The chains 72, are endless and receive their movementfrom chain-wheels n on the shaft 70, the chains passing overguide-pulleys n at both sides of the apparatus and also over chainwheels 0 and o. The chains pass through wrought-iron tubes 79 in theouter walls 2 and central partition a, said tubes 20 closely surroundingthe chains and being preferably fiared at their ends. The fine dust isconveyed to the intermediate spaces Z by the chains h and falls intodust chambers m.

The whole tube system of the apparatus is inclosed by the outer masonryz and is suspended therein by means of wrought iron hangers 1 supportedfrom the roof 2. This suspended arrangement prevents the tubes frombeing submitted to bending stresses and at the same time permits them toexpand and contract.

The space above the tubes at is divided 011 by means of plates 9 whichpreferably rest on the flanges of the plates 0 and in this space isarranged. the driving gear for the tube scrapers which comprises chainwheels 3 which are driven from an external chain wheel 5, chain 6 andelectromotor 1' and over which passes an endless chain 4. The motor maybe of such type that it automatically stops and reverses in rotation assoon as the scrapers have reached one or other point in their movement.

The scrapers for the tubes comprise ironframes which are supported bychains 8 from the chain wheels 3 and are moved vertically to and fro,the frames balancing one another so as to economize power. As shown inFig. 5, the scraper frames comprise two strong U-iron girders t ridigdlyconnected together by a pair of I-iron beams u and angle-irons '0.Similar I-iron beams 24 are loosely supported by the girders t andintermediate each row of tubes (6, these beams a carrying the scrapers wsurrounding the tubes at, as shown in detail in Figs. 6 and 7. Screwedor otherwise secured to the beams u and u are notched blocks :0 whichposition the upper split collar w by engaging lugs 1.0 thereon. Thesplit collars to carry vertical rods w which support the actual two-partscraper 'w and are maintained in position by means of clamps, screws orthe like, or as shown, by .L-iron beams y. The scrapers w press tightlyon the tubes 0; and if desired, their contact may be insured by formingthe lugs 10 of wedgeshape with or without a rounded lower edge, so thatthe pressure of the beams y thereon tends to press the scrapers wtightly against the tubes a. For this purpose it is also preferable tomake the up er rings 10 of oval shape, as seen in Fig. so that they morenearly approach the tubes at in proximity to the lugs 10 than at rightangles thereto.

The hereinbefore described construction of scrapers enables them to befitted in economizers already built and enables any of the parts to bereadily renewed.

I claim 1. In an economizer, regenerator or the like, a plurality oftubes arranged in rows inclined at an acute angle to the flow of the hotgases, said tubes forming the heating surface and offering littleresistance to the flow of the hot gases while enabling the applicationof horizontally moving scraping devices.

2. In an economizer, regenerator or the like, a plurality of tubesarranged in rows inclined at an acute angle to the flow of the hotgases, said tubes forming the heating surface and offering littleresistance to the flow of the hot gases, and a plurality of scrapingdevices intermediate the rows of tubes.

3. An economizer, regenerator or the like, comprising a chamber, inletand'outlet hot gas connections to said chamber, head boxes spaced apartin said chamber andhaving oppositely facing fiat sides, a plurality oftubes between said head boxes and arranged in rows inclined at an acuteangle to the flow of the hot gases, a plurality of scraping devicesmovable over the flat side of the lower head boxes and intermediate therows of tubes, a dust chamber below said lower head boxes and air inletand outlet connections to said head boxes.

4- An economizer, regenerator or the like, comprising a chamber, inletand outlet hot gas connections to said chamber, head boxes spaced apartin said chamber and having oppositely facing flat sides, a plurality oftubes between said head boxes and arranged in rows parallel to oneanother in a direction at right angles to the flow of the hot gases andparallel to one another in a direction inclined at an acute angle to theflow of the hot gases, a plurality of scraping devices movable over theflat side of the lower head boxes and intermediate the rows of tubes atright angles to the flow of the hot gases, a dust chamber below saidlower head boxes, air inlet and outlet connect-ions to said head boxesand scrapers movable vertically over said tubes.

5. In tubular economizers, regenerators or the like, scraping devicescomprising a frame surrounding each. group of tubes, cross-supports insaid frame .and intermediate the rows of tubes, and scrapers supportedfrom said cross-supports and surrounding said tubes.

6. In tubular economizers, regenerators or the like, scraping devicescomprising a frame surrounding each group of tubes, cross-supports insaid frame and intermediate the tubes chain Wheels, chains passingaround said Wheels and supporting said frames and so arranged that theframes balance one an-' 15 other, and means for driving said chainWheels.

In Witness whereof I have hereunto set my hand in the presence of twoWitnesses.-

\VALTHER MATHESIUS.

Witnesses VVOLDEMAR HAUr'r, HENRY I-IAsrER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

